TRANSIENT STABILITY ANALYSIS OF A 3-BUS POWER SYSTEM DUE TO THREE-PHASE SHORT-CIRCUIT FAULT
DOI:
https://doi.org/10.35261/barometer.v11i3.13231Abstract
Transient stability is one of the important aspects of electric power systems to maintain generator synchronization after severe disturbances occur. This study aims to analyze the transient stability characteristics of a 3-bus electric power system under a three-phase short-circuit fault at Bus 3 using the Electrical Transient Analyzer Program (ETAP). The research method was conducted through a simulation-based approach involving load flow analysis, three-phase short-circuit fault simulation, rotor angle response analysis, rotor speed response analysis, and critical clearing time (CCT) calculation using the equal area criterion approach. The simulation results indicate that the fault current increased up to 136.78 kA and caused the voltage at Bus 3 to drop to 0 kV, while Bus 1 and Bus 2 experienced significant voltage decreases. The power angle relative response showed divergent oscillations indicating loss of synchronism, which was reinforced by rotor speed deviations from the synchronous speed of 1500 rpm. Furthermore, the calculated CCT value was 0.0524 s, indicating that the protection system must clear the fault within a very short time to maintain rotor stability. Therefore, the studied 3-bus power system has a relatively small transient stability margin under the applied fault condition.
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